Pipe-threading machine



. (No Model.) 2 Sheets-Sheet 1.

R. P. & L. B. CURTIS. PIPE THREADING MAGHINE.

' No. 443,500. Patent ed Dec. 30,1390.

WITNESSES:

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R. .& L. .-B. CURTIS.

' PI HREADING MACHINE. No.443,5 00. Patent edDec. 30,1890.

ATTORNEY UNITED STATES PATENT OFFICE.

RODERICK P. CURTIS AND LEYVIS B. CURTIS, OF SOUTHPORT, ASSIGNORS TO CURTIS & CURTIS, OF BRIDGEPORT, CONNECTICUT.

PlPE-THREADING MACHINE.

SPECIFICATION forming part of Letters Patent No. 443,500, dated December 30, 1890.

- Application filed March 28, 1890.

T to whom it may concern:

Be'it known that we, RODERICK P. CURTIS and LEWIS B. CURTIS, citizens of the United States, residing at Southport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Pipe-Threading Machines; and we do hereby declare the following to be a full, clear, and exact description of the invention,

to such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to certain new and useful improvements in pipe-threading machines, but especially refers to that class of said machines in which a rotary die-carrying ring is adapted to have a sliding movement within a casing, whereby the dies may be brought into operative engagement with the pipe to be threaded.

Our invention consists in providing certain means, hereinafter to be described, for forcing the die-carrying ring inward, so that the threading-dies may initially take hold of the pipe, and, furthermore, our invention con sists in so constructing the cam-plate which operates to open and close the dies that the latter may be readily removed and replaced without detaching said plate, all of which will be readily understood from the detail description hereinafter set forth, and by reference to the accompanying drawings, in which- Figure 1 is a front elevation of a pipethreading machine provided with our improvements; Fig. 2, a section at the line 00 a: of Fig. 1; Fig. 3, a'section at the line y y of Fig. 1; Fig. 4, a detail perspective of the diecarrying ring and cam-plate detached; Fig. 5, a rear view of the cam-plate, and Fig. 6 a front elevation of the die-carrying ring with the cam-plate removed and the threading-dies properly assembled Within said ring.

Similar letters denote like parts in the several figures of the drawings.

A is the casing, and B the die-carrying ring within said casing and adapted to have a free sliding movement therein.

C is a finger extended transversely through the rim of the casing and capable of a free sliding movement. The forward end of this Serial No. 345,680. (No model.)

finger extends over the edge of said ring, while the casing in the immediate rear of said end is recessed, as seen at a, so thatwhen the finger is moved backward said forward end will bear against the ring and force the same rearward, as will be presently set forth. The rear end of this finger is notched, as seen at b, and the nose 0 of a dog D projects with in said notch. This dog is pivoted between ears (Z, which are cast with the casing, and by depressing the tail 6 of the dog said nose will operate to .draw the forward end of the finger inward against the die-carrying ring, whereby the latter is forced rearward to carry the dies into operative position against the 6 5 pipe to be threaded.

E are guideways cast with the ring B interior thereof, and within which the dies F are adapted to slide freely, as will be clearly understood from Fig. 6. At the rear ends of the outer faces of the dies are pins f, which project forward.

G is the cam-plate, having cam-grooves g, and h are straight grooves leading into said cam-grooves from the inner circumference of 7 5 the plate, all of which will be readily comprehended by reference to Fig. 5.

In assembling, the cam-plate is placed within the ring 13 in the relative position shown at Fig. 4., and then turned until the straight 8o grooves h register with the spaces between the guideways E. The dies are then inserted within said spaces, the pins f extending within the grooves h, and are thrust backward until they abut against the rear walls of the 8 5 grooves g. The cam-plate is now turned by means of any suitable handles H, secured to said plate, and said pins thereby caused to travel within said grooves g. The dies are thus caused to advance or recede within the ways E, according to the direction in which the plate is turned. The cam-plate is not removed when it is desired to take out the dies, for it is merely necessary to turn said plate until the grooves h register with the spaces 5 between the ways E, when the dies may be readily drawn out.

Permanent adjustment of the dies is effected by means of bolts 2', which extend from the die-carrying ring through concentric curved 10o slotsj in the eam-plate, and thumb-nntslr run on said bolts and are adapted to bind against the face of said plate in the usual manner.

The diecarrying ring has cogs on its periphery and receives rotary motion from an elongated pinion I, which is journaled within the casing and meshes with the said cogs.

Having thus described our invention, what we claim,and desire to secure by Letters latout, is-

1. In a pipe-threading machine having a rotary die-earryin g ring capable of a free slidin g movement within a casing, the finger hav ing a bearing transversely through the rim of said casing, the front end of said finger being extended over the edge of the die-carrying ring, while the rear end is notched, in combination with the dog pivoted to said casing and having its nose projected within said notch, substantially as set forth.

2. In a pipe-threading machine, the combination of the casing, the die-carrying ring havinga free sliding movement therein, the finger extended through the rim of the casing and havinga bearing against said ring, and means, as a pivoted dog, connected with the rear of said finger, for forcing said finger inward against the ring, substantially as shown and described.

3. The combination of the casing, the diecarrying ring adapted to slide therein, the Iinger adapted to slide within the rim of said casing and projecting at its front end over the edge of the said ring and provided at its rear end with a notch, the recess formed in the front edge of the casing for the accommodanation, with the die-carrying ring provided with guideways for the reception of the dies, of a cam plate having cam grooves and straight grooves leading into said cam-grooves from the inner circumference of said plate,-

and the dies adapted to be inserted within said guideways and having pins which extend within the grooves in the cam-plate, substantially as set forth.

5. In a pipe-threading machine, a die-carryin g ring and a cam-plate, both having straight grooves capable of registering by axial rotation of said plate, said plate having camgrooves into which the straight grooves in said plate lead in combination with the dies having pins projecting forward from their rear ends, said dies adapted to be inserted within said grooves when registered with the pins extending within the straight slots in the plate, whereby when said dies are thrust back and the plate turned axially said pins will enter the cam-grooves in the plate, substantially as shown, and for the purposes set forth.

In testimony whereof we affix our signatures in presence of two witnesses.

RODERICK P. CURTIS. LEWIS l3. CURTIS. Witnesses:

l1. XV. SMITH, Jr., J. 1. FINCH. 

